Etymology
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nag (v.)

1828, intransitive, "find fault constantly;" by 1840, intransitive, "annoy by continued scolding, pester with petty complaints," originally a dialectal word meaning "to gnaw" (1825, Halliwell), probably ultimately from a Scandinavian source (compare Old Norse gnaga "to complain," literally "to bite, gnaw," dialectal Swedish and Norwegian nagga "to gnaw"), from Proto-Germanic *gnagan, related to Old English gnagan "to gnaw" (see gnaw). As a noun, 1894, "act of nagging;" by 1925, "person who nags." Related: Nagged; nagger; nagging.

nag (n.)

"old horse," c. 1400, nagge "small riding horse, pony," a word of unknown origin, perhaps related to Dutch negge, neg (but these are more recent than the English word), perhaps related in either case to imitative neigh. The term of abuse "a worthless person," often of a woman, is a transferred sense, first recorded 1590s. For "one who annoys by scolding" (by 1925) see nag (v.).

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Definitions of nag
1
nag (v.)
bother persistently with trivial complaints;
She nags her husband all day long
Synonyms: peck / hen-peck
nag (v.)
worry persistently;
nagging concerns and doubts
nag (v.)
remind or urge constantly;
she nagged to take a vacation
2
nag (n.)
someone (especially a woman) who annoys people by constantly finding fault;
Synonyms: scold / scolder / nagger / common scold
nag (n.)
an old or over-worked horse;
Synonyms: hack / jade / plug
From wordnet.princeton.edu